Core for molding hollow walls



J. E. FIFIELD.

CORE FOR MOLDING HOLLOW WALLS. APPLICATION FILEDVJUNE 12, 1920.

Patented Apr. 5, 1921.

IN V EN TOR. 1595/? E //F/ELO.

A TTORNEY f NITKED STA i JASPER E. FIFIELI), OESAN DIEGO, CALIFORNIA.

GORE FOR IVIOLDING I-IOLLOW'l WALLS.

Application ledJune 12, 1920. Serial No. 388,613.

T 0 all fw hom t may concern Be it known that I, JASPER E. FIFIELD, a citizen of the United Sta-tes, residing at San Diego, in the county of San Diego and State of California, have invented certain new and useful Cores fo-r Molding Hollow vWalls, of which the following is a specification.

My invention relates to molds for forming voids in concrete walls for building construction and the objects of my invention are: first, to provide a mold which has a smooth outer surface and Yis collapsible so that it may be collapsed and removedvafter the concrete has partially set; second, to provide a mold of this class in which voids of rectangular shape may bereadily molded; third, to provide a mold of` this class in which the side plates are interchangeable and may be used for different width voids, the only requirement being the substitution of different end members-for creating different width voids in the walls of concrete buildings during construction; fourth, to provide a structure of this class in which the sepa-rate engaging portions areo'n an angle so that with slight raising of the end member they readily separate and collapse and fifth, to provide a mold of this class which is very simple and economical of construe tion, durable, easy to operate, easy to install and remove and which will not readily deteriorate or get out of order.

With these and other objects in viewY as will appear hereinafter my invention consists of certain novel features of construction, combination and arrangement of parts and portions as will be hereinafter described in'detail and particularly set forth in the appended claims reference being had to the accompanying drawings and to the characters of reference thereon which form a part of this application in which:

Figure 1 is a topview of two of my mold structures shown mounted in position in the wall and showing the wall fragmentarily; Fig. 2 is a fragmentary side elevational view of one of the molds shown positioned in the wall; Fig. 3 is an end view thereof; Fig. 4 is a fragmentary sectional view through 4;-4 of Fig. 1; Fig., 5 is a sectional view on an enlarged scale through 5-'5 of Fig. 2; Fig. 6 is a sectional view on an enlarged scale through 6-6 of Fig. 3 and'Fig. 7 is a perspective view of the mold with narrower end plates for making narrower voids.

.Similar characters of reference refer toV similar partsV and portions throughout the several views of the drawings.

Thevside plates 1, end plates 2 and sep'- arator bars 3 constitute the principal parts vand portions: of my wall void mold. The

side plates 1 are Vthe same shape and are therefore interchangeable.v They are each provided at one side with a downwardly tapered edge and with a conforming tapering stripvlaN on one side separated by a separator 1b and the three riveted together forming a tapering groove along the one side edge of the memberl.v The opposite side is provided with a right angled bend 1c and with a tapering vedge on'said right angled bend and spaced apart therefrom is a conforming strip 1d provided with a divider 1e for separating'the portion 1c from the member 1d and leaving a like tapering slot. VThe end plates are also of the same shape and therefore interchangeable and are provided with offset tapering sides 2a along one edge andVV with a right angled bend 2b along the other edge and on the edge of the portion 2b is provided an offset angled portion -Qcconforming to theangle of the members 1, 1a and 1b so that when these offset portions are mounted in the slots 'thel outer surface's'of the members 1 and 2 are flush thus provid-A lng smooth outer surface for the mold structure and when the end members 2 are positioned as shown inthe drawings in their relativeposition with the members 1 there isprovided a hollow box shaped form which may be positioned in the wall and the cement poured around the same and after it has set sufficiently to become firm the members 2 may be raised by the application of a bar in connection with the lugs 2d on the inner surface of the end membersQ.

Secured tothe side members 1 intermediate their ends are bifurcated lugs 3a in which are pivotally mounted the ends of the spreader-bar 3 preferably by means of tapering pins 3b conforming. to holes in the lugs adapted for said pins for connecting the ends of the'spreader bar 3 with the lugs Y 3a. It will'be noted that these spreader bars 3 'are positioned on an angle to permit the side members 1 to' move toward each other when the end members are removed and that the side plates 1 are interchangeable and may -be used for different width voids; the end plates-2 Vhowever are of different widths to provide for varying width voids and are used interchangeably end for end and in connection with the side members.

Though l have shown and described a particular construction, combination and arrangement of parts and portions l do not wish to be limited to this particular construction, combination and arrangement but desire to include in the purview of my invention the construction, combination and arrangement substantially as set forth inthe appended claims.

1t is obvious that with this construction there is provided a mold for making voids in concrete walls so constructed that the void may be substantially rectangular in form;

that the end members 2 when positioned form a rigid support in connection with the side members for providing voids in concrete wall structures; thatsaid end members being tapered may be readily released by upward pressure against the lugs 2d and as soon as moved slightly may be readily drawn and the spreader bars 3 being pivoted on the tapered pins 3b in the lugs 3a the sides ill collapse thus providing for the ready removal of the mold whereby it may be repositioned in another place and used again for the same purpose; that in case it is desired to make narrower voids of the same length the same side members can be used and similar end members of narrower width provided with the same angles and operated in the same way. In this case, however, the spreader bars 3 must be shorter.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

l. A mold for forming voids in concrete walls, including side plates provided with an inclined edge at one side and with a right angled turn at the other side provided with an inclined edge and end members'each provided with a right angled turn, with conforming angles on its side edges adapted to engage the angles on said side members.

2. A mold for forming voids in concrete walls, including side plates provided with an inclined edge at one side and with a right angled turn at the other side provided with an inclined edge, end members each provided with av right angled turn, with conforming angles on its side edges adapted to engage the angles on said side members and means for supporting vsaid side members relatively to said end members whereby the outer sur- 'faces of said members are in a straight line.

3. A mold for forming voids in concrete walls, including side plates provided with an inclined edge at one side and with a right angled turn at the other side provided with a. similarly inclined edge, end members each provided with Va right angled turn and with conforming inclined edges adapted to engage the inclined edges on said side members, mea-us for supporting said side members relatively to said end members whereby the outer' surface of said members are in a straight line and spreader bars pivotally connected at each .of its ends to lugs on said side members provided with tapering pins whereby they may be readily released and Y 'said side members whereby said members are Hush with each other at the joints on their outer surface. Y

5. A mold for forming voids in concrete walls, including a pair of interchangeable side menibers,each provided with a slotted inclined edge and its opposite side turned at a right angle and provided with a slotted inciined edge, a pair of interchangeable end members, each provided with a right angled turn and its side edges provided with offset portions adapted to engage the slots in said side members wherebysaid members are ilush with 'each other at the joints on their outer surface and lug meanssecured tosaid end members to facilitate the upward movement or" said end members relatively to the side members vwhereby they are released from said side members after a slight upward movement.

6. A mold for forming voids' in concrete walls, including a pair of interchangeable side members, each -provided with a slotted inclined edge and its opposite side turned at a right angle 'and provided with a slotted inclined edge, a pair of interchangeable end members, each provided with a right angled turn and its side edges provided with oil'set portions adapted to engage the slots in said side members .whereby said members are 'flush withl each other at the joints on their outer surface, means secured to said 'end members to facilitate the movement of said end members relatively to the side members whereby they are released from said side members after a slight upward movement and means for supporting said side members relatively to each other intermediate their ends consisting of a bar releasably connected enlarging, inclined edges conforming to the edges on the iirst-two mentioned plates.

S. A deviee of the class described, includspreader bars pivotally connecting said side ing r'our plates, each provided with a right members positioned at an angle therebe-V nngled turn, two of said members provided tween. 10 with downwardly, enlarging, inclined edges In testimony whereof, have hereunto set and the other two members with upwardly, my hand at Sen Diego, California this 5th enlarging, inclined edges conforming to the day of June 1920. y edge on the first two mentioned plat-es and JASPER E. FIFIELD. 

